For me it's highly annoying that you can copy a line without having text selected. Since cmd+c and cmd+v are so close together, it's very common for me to accidentally hit cmd+c instead of cmd+v since I'm pressing cmd with the left thumb at the same time. This happens to me several times during the day:
I select and cut some code with cmd+x
I move to an empty line and accidentally hit cmd+c instead of cmd+v
...clipboard now consists of "\n" instead
I have to press cmd+z to get my code back, then start all over again.
I get depressed